package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 统计时间区间的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        //当前集合用于存放从begin到end范围内的每天日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();

        for (LocalDate date : dateList){
            //查询data日期对应的营业额数据，营业额指状态为“已完成”的订单金额合并
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);

            //select sum(count) from orders where order_time < ? and satus = 5
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 :turnover;
            turnoverList.add(turnover);


        }

        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end){
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while(!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的新增用户数量 select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();

        //存放每天总的用户数据
        List<Integer> totalUserList = new ArrayList<>();
        for(LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end",endTime);

            //总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin",beginTime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

            //封装结果集
        return UserReportVO
                .builder().dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end){
        //当前集合用于存放从begin到end范围内的每天日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //日期计算，计算指定日期的后一天对应的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的订单总量
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天有效订单量
        List<Integer> validOrderCountList = new ArrayList<>();

        for(LocalDate date : dateList){
            //查询每天的订单总数 select count(id) from orders where order_time >? and order_time <?
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime,endTime,null);

            //查询每天有效的订单数select count(id) from orders where order_time >? and order_time <? and status = 5
            Integer validOrderCount = getOrderCount(beginTime,endTime,Orders.COMPLETED);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单的完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();

    }

    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin,LocalDateTime end ,Integer status){
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }


    /**
     * 根据条件统计销量前10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getTop10Statistics(LocalDate begin, LocalDate end){


        //nameList numberList
        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.top10ByMap(beginTime,endTime);
        //   Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");


        List<Integer> number = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(number,",");



        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    //导出运营数据报表
    public void exportBusinessData(HttpServletResponse response){
        //1.查询数据库，获取营业数据--查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30); //减30天的时间
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        BusinessDataVO businessDatavo = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2.通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");//在类路径下读取资源返回输入流对象

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取表格文件的Sheet文件
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDatavo.getTurnover()); //第3个单元格
            row.getCell(4).setCellValue(businessDatavo.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDatavo.getNewUsers());
            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDatavo.getValidOrderCount());
            row.getCell(4).setCellValue(businessDatavo.getUnitPrice());
            //填充明细数据
            for(int i=0;i<30;i++){
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN),LocalDateTime.of(date,LocalTime.MAX));
                //获得某一行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessDatavo.getTurnover());
                row.getCell(3).setCellValue(businessDatavo.getValidOrderCount());
                row.getCell(4).setCellValue(businessDatavo.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDatavo.getUnitPrice());
                row.getCell(6).setCellValue(businessDatavo.getNewUsers());
            }
            //3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }


}
